Hearing an octave that shouldn't be there?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by CaptainCrunch, Feb 21, 2008.

  1. CaptainCrunch

    CaptainCrunch Member

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    Amp is a Reverend Hellhound 1x12 combo. When I play much above bedroom levels, I'm getting a lower of octave of the single note, and the more gain the worse it is. It's as drastic as using an octave pedal. It starts getting very noticeable on the B flat (B string or E string) and above notes. It's the same with different guitars and an extension cab. I've had it suggested it could be the filter caps, tubes, or ??? Anybody know what this would be a symptom of???

    Before I take it in to a tech, I'd like to have an idea, not that I don't trust him but... well I'd just feel better going in with at least a little clue. Thank you!
    Scott
     
  2. phsyconoodler

    phsyconoodler Member

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  3. Hacksaw

    Hacksaw Time Warped Gold Supporting Member

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    What speaker is in the amp? Sounds like ghosting.. Maybe?
     
  4. Rosewood

    Rosewood Member

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    Sure sounds like cone cry. What speakers are you using?
     
  5. CaptainCrunch

    CaptainCrunch Member

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    It's a mojotone black beauty, the extension cab I tested with has a Texas Heat. I did swap power tubes, I was getting some motor boating? before but the power tube swap took care of that. I have not changed the pre-amp tubes yet.
     
  6. rockon1

    rockon1 Member

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    Definately try the pre's and PI -its worth a shot . Bob
     
  7. Ronsonic

    Ronsonic Member

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    I'm betting you need filter caps.

    Motorboating and ghost harmonies are pretty typical symptoms.
     

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